(19)

(11)

EP 4 284 769 A1

(12)

(43) Date of publication: 06.12.2023 Bulletin 2023/49 (21) Application number: 22746581.2 (22) Date of filing: 27.01.2022

(51) International Patent Classification (IPC):  C04B 35/468(2006.01) C04B 35/495(2006.01) C04B 35/47(2006.01) (52) Cooperative Patent Classification (CPC): H01G 4/1227; H01G 4/30; C04B 35/495; C04B 2235/3255; C04B 2235/3201; C04B 2235/3203; C04B 2235/3208; C04B 2235/3213; C04B 2235/3215; C04B 2235/3232; C04B 2235/3244; C04B 2235/3293; C04B 2235/36; C04B 2235/3224; C04B 2235/3239; C04B 2235/3258; C04B 2235/3225; C04B 2235/3256; C04B 2235/3418; C04B 2235/3229; C04B 2235/3227 (86) International application number: PCT/US2022/014032 (87) International publication number: WO 2022/164986 (04.08.2022 Gazette 2022/31)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 28.01.2021 US 202163142766 P (71) Applicant: Kemet Electronics Corporation Fort Lauderdale, FL 33301 (US)	(72) Inventors: GUO, Hanzheng Simpsonville, SC 29681 (US) GURAV, Abhijit Simpsonville, SC 29681 (US) (74) Representative: Goodman, Simon John Nye  Reddie & Grose LLP The White Chapel Building 10 Whitechapel High Street London E1 8QS London E1 8QS (GB)